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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36d7eebeeeb440f4d15b0d9b6e64e59fe1dea979ac7d29a3a6c2fa92d9d1299' 
  AND token = 'd7cRWWjYXWdASzP1sFd2usBRIMykXvV2heAnrvLMef8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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