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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a76482829151e82b4aa66c10449bd188031e190580f7cb25068f57540db86a' 
  AND token = 'j908zCLbtuyOjCD91O1FyRv4Z92KfLMQlYownv9Vw60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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