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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f88a620ebf4032ec70c60370d5ecd0c422d454a5306ff4f19ea0f8b95f73aea' 
  AND token = 'rs7Z+L65ZFVrrNi9iN8Qh0/PHsgrS+X5tKFGBP7XjJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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