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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc156573d0fdb8811fb4cfb9e3398c5d51a8907cd688b47fe35d9f6c53f4571' 
  AND token = 'FkCnEk6fn8aws0np3Ls9aEexURmMGPkV3B67TIxkWBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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