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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a64e2e16bea6ffb29a3ea0d7f3d91da2ba78d0f0444ba4fee1ccdf489698b7' 
  AND token = 'DLuAAhSX55oVyKYgfu+aLXeDsvEb7UeD8OiERXxf2A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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