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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6d01eaa8adcff39b4a4a16d99c2ed6ecb14cfae404bb8795b3cc8eeb737d02c' 
  AND token = 'n5BXok8CE+vou0Y/7LAiqEn8O9waqWffPXAGKTuki10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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