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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '425d6568cb87e80d99a95f0c9505afd73c127def460341cebe582c5cd08d793f' 
  AND token = '1o1P1eJPy25IEkRrP8XXsoH2HUHHBnaKurizST63/VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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