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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5f8880cde2a43dadfa4c03d15c895472c433488154d0a6eaa9453ff74d37cd' 
  AND token = 'uRAzRRX4FQ7jwybwaJUbWTbqeCO0dJnGareAX2A62CI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}