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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cec80f40047b3ecc2a05b75e1c77bf8c8ea14559ee4a14e8365a125d6b6637' 
  AND token = 'gcUSDr3/diYXVg3YyJhk5zpwSCNyO4c6Yo38X2a03js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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