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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa66515e659b650c727c6c552b2e2f9a025e7b69479007d47d9e83658b5bfd48' 
  AND token = '0Pjcru00sAGWDTao0nTbvArNN0ILrwGqlH5Bry2C2rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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