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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026db5b18e02fe4ed63d60bfff69ed612b6469317c812b75525f0940a4171ed1' 
  AND token = 'nxKH9F4LtYEcHiP050/9kDJJ5hiSRoDQIwIF4R7217Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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