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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611542d89afac5fdf28c641d60c99fa72576bf6a1c99bb65f76a0f8e7660408c' 
  AND token = '1mzUGF6cb6m6VUW750rst9viru0rJvOuqtpzKFLLf9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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