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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ddc857d8040522a0685cea431ba2f1596943cb6839dcf0c231d0117f6da26b' 
  AND token = 'dA+QkEC0ZD1/b6TH2BQaQciNa209zF/BGqP8dl6FDzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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