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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b37eeab84b8f33ab2e40e63c5d3833fd2dc5c4c0c4d1087a80427d7d9aa900' 
  AND token = 'cvapwYPBHoDbsUJ6awV3Q/mKsuuTMpT8l28XKrDGed4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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