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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d3aa953a8b6f45cf1906b53e25a3b8ce04243a9c6b18fdba85896e2e3187b0' 
  AND token = 'MM9hBGIRqapPnC12EWGSctOmDrVZ/mtZR+39PutDMi0=' 
  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"
    }
  }
}