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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1d0190c29aa02a374ca449c4d41f6b838df9594e8a1b5f99eab378367fd86dd' 
  AND token = 'musvhSHdtYJSk+yWO2g6/jhUHe5w6b0JTYNeiupj+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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