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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9e49862092b274bdc00d02cbacd61b61ab356e77ef609769ae86a9de04b80d6' 
  AND token = 'XJc9T3lHoDHqKb96ZkPpGQ92Ip9kcY3G0go9h2z9bjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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