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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce116087eda8fd8e76d8e7b465b01998f798c07fa35451c0a59138263a321d74' 
  AND token = 'Z9sShcu+HurhPi7k6XhyO6OTtQbVJJkruFypyaKVwo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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