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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae89301478acb4fc9f4cf1c58971cdda09a23b559276ecd0a90f39b1fbdff4f' 
  AND token = 'Hr7rGnMHs++xSyZZpoIXPleQMih+XjFKV0p9tvWVCOU=' 
  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"
    }
  }
}