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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca554dcb24983ec3cb06bd083a3af357151598245d0182872999956086d6bd99' 
  AND token = '7BMMDO2EuAUt023MMsJzRAlXeUp+jt3k2QACz4ngNl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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