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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1549de3aa17b3cbb7c2db46a0b298d4164ae57652ab5c48c83889cf0b523f699' 
  AND token = '1nr0cN4Sl7R0pWXXVnN5EhfUg0ga0TPR5TGTp7yCnd0=' 
  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"
    }
  }
}