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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd45c0dfb1489c7a3b836df48ebe24c80c8a6a7079d85c7ca9eda7aeefe57d12' 
  AND token = 'yf7QfN/8Jr6NZzBRP0o04kR1Wv1l0xaQIXpofhJY1IE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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