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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6658fc8fa7d095319991b6ccd1ca097b66cae6cc6988c5389f0aed02ff59219' 
  AND token = 'Wk5dWIwjMa9sk89t2mzoBdoYlRSzzr4IW7ODKICJKF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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