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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aea90dfef79a1388f7aab035c9bb7ff086a6637e32f93508336aad765622115' 
  AND token = '/p5B15ratbgxVBcqfeu6c5CordvzgSKKuG/Fb75VZzU=' 
  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"
    }
  }
}