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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad474a6aacaf5c14fc2948fbad0c70283ef8b13f7c1cb890b4f5094e105ebbbd' 
  AND token = 'G+KKcAiVLOzJtTyalJUb0Z4Pc/SgQkbk7va5wrridfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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