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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7742e58f15269b631f82f78c0c001bb8b0836b1346b3bcef71e750afcea9b328' 
  AND token = 'a4C8H5wiUur7/cqrVQoOdxJCNV37/ums1JBBjwmayHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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