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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec79684becbc3d506ff1330c67d7d46eacf4cdb8f572b70d2f113d0b52e056a' 
  AND token = 'ekN8fxLA4J8T3//dlW6UDyb+5rtUMtPeP4+JD0SA7nQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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