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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f341d285aa15462f5d29bf5c9eda76c4aae9d951197ba3e0308b6bc64791d135' 
  AND token = 'qGVaQR+nm8AyNpySr9O5BzfAy5og1PIg5lRWaPnfej8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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