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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04132c06e3ac71b280f3a01f7717975ac50199c9eb6e0bdb5be1e5a86f8b9cf' 
  AND token = 'Tq9e0TDXcKajOZUpEmodfLFh+IBJd2qoebUT0FsEywc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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