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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '211bdfffc361268f9eb3d41fbbecc2d12c5f7beb3fefb48e95538be443016b32' 
  AND token = 'l1oIrx4znyk3ePAztZbflpmkR1D6Kjqi3fJdy1NcBz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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