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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37ae9048ea5209286c7be4b0e6da8ae4bc3dcec1b0d24975adba98aac952b5b' 
  AND token = 'PYXApcF1A5V5QfeT3bO+x2EPtJS68Let1agVdqSGyNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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