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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90e462c65db8b75081c233dd2f88558df936b88750b1c5b1fd0ec6a96e547a2' 
  AND token = 'MU58gPPxcttnsVUE0ZIP8U61/S6rtI5w+rvbBp5f42Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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