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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59757a0e981ea93a12844dd26cca63e6dac48ce771103d5bec6494dc185c6168' 
  AND token = 'oKb48G7fB5H5E5BH5+IUnEqv1BLnr6dOaOUoUoWCkto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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