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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb817467509441e6149232f1c48723905a8c5486cdf3b46c448395f01af64cc' 
  AND token = 'uC7nHN8t5/xlodKG+aOV7Rksmqzbs+qq3ywXypV9bX4=' 
  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"
    }
  }
}