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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4042af241e8ad17e1bdfbe2a0ed3f30ccacab2d9cc7d6838fe310aa6463ff7e7' 
  AND token = 'AD6BWwUM1vYn96IAhTGzUigDyHglzwvlGJ7jQEqbkcU=' 
  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"
    }
  }
}