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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57b50a61ba0d57c155709a06ac4a8c06bdc639a7ac5fb8d113e9c897ffa8263' 
  AND token = '9F57XW0+YlCJSKcFi/G7NURk8H46Ihw0uf/v4256wDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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