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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '049e8301107acbd13430c43a86d1cfc5169b437660d4b5851f094fc75b7d3d11' 
  AND token = 'DA73ajm8E2BvjdVf3RT6PG7h81nCkduq393UdXQWbao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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