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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33279899c02f29598b5e0dd52899eab7208db34dc798fcaede996fa7d6247eeb' 
  AND token = 'TCJ1v8pJtggUgOTd6Cv8JVm8OUjClcUVm9cr/DHG8TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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