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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fca6c609ac94409bbd254fd1f3d1f9adfc412ebd1300b5b791ce86e9484244c' 
  AND token = 'dssm/py623h0r/YNoivjuUFuteiYs9XkAuUywa6kA1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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