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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd592169aef4b4b3c5a15c088c8f4ae07f06ed610c2e11fa87c7b135046fee2c9' 
  AND token = '2OEDw+ySe0k/UIOczumWLC7S7IOW4PD6iCDxRxbjB3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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