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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04171da99cfd15c1f1776fe8d3916d6550cc86b37ab09ee428c1405cc4c4d6ef' 
  AND token = 'rjY9y01fKsD97WsYEEihfMYbv5J9z+drqqjlnNVZevo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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