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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40727fd2c0408fe2c7512f2f7701b5a4033ce8b9dfbab81b4ceeaa73d56879a7' 
  AND token = 'wQHkmL/2DRr8lllTdH8IAfV/RIpZ9pxsu9i36LPPcZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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