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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96edc8f33cc7503ccb4dd0e52a1a570e6c6ee9ca9c024f1b0c27e3400f59d2af' 
  AND token = '3WKBmyyUkdlVdlUYQsCnz9XDZ9JnF+HJN7NmuvsWe0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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