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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c7d0470bd97b94202870e3a939bc04b3d8ee0e48e14607a25a59107633dafa' 
  AND token = '5Ud79hlJu3QJGgNp/DpvQ6Y/3F+EG2p/8BoGqaunFxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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