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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7d9f21d6ddbe3ece2e89e58afe84e0a3da9ab6f2df3f64bc62fbfbdd7561bd' 
  AND token = 'HzJBAK+qvMgK39J9nO6J4g6GdtbkpRU3oB4hhkAmMpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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