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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83963a210309a27429374917e6f256fa1dba300b59b923c60a27bd3ad71f9b9' 
  AND token = 'y7o8wjpWz2yktNjFG8xmOb13zgjiW8c5wf5e3RRoJq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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