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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1d44ce14f70187b34c6565c1f7138e6516425f0354106e753ad6f9bb8c048b' 
  AND token = 'PcS66sap4MXqEx5RXZ1poeIhe3kN0Y1hin/PZ1vus+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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