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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89cd32be90c1a881e45ad2a84ac70dc58e7e113c76af18a5a126c2c65ec8a2dc' 
  AND token = '1Evz+GjL3umPHXuXudOWr2Ygtk+lNar0evfeRJnYS8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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