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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9223a491f8eb9cd289d2f595481496828c78632dd725a26801675a95ed5af496' 
  AND token = 'TykOMVXT2dJC+dr5vzpx7L2G4YBWJlaGX4cmUQkJBw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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