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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37752eaf59fe30d23d1176b247c3e2f34f733c0dba1d063f854b53ace3d388e7' 
  AND token = 'PRMNAoK0HJqQnq1j1cnb7rYfeOlZ1F1Qso7PSOVsEHQ=' 
  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"
    }
  }
}