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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bd421399528b4ab7c83c87901a3d9b2613ca2f4456d2f7639ffc54c9bbd0eb' 
  AND token = 'qeahBkuNmHrreFFMwYqEEosW9Gn6s8bZgZ4yLYxqQLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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