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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bf66077d1796a36818ff5c8deeab4d6dd399efa1e443c7ca55837a290635f06' 
  AND token = 'YqD6b8Cr3oQ+YxLHaCm6DNWZC7bynBG0dUR9D1pVPgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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