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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '043dd16ffd0b70d9f281ee75af815fb0de101ed3d73a4c035ef6b7acf4d6e43e' 
  AND token = '4XHpIj/jmfxtEymBe+XnVf0pajr180ItMfMIavPJUl4=' 
  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"
    }
  }
}