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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb13563b8a661bcf662ec5f9f267a2cf4f9311e6ad30a21937240b284679adc' 
  AND token = 'DkOOLnExfe1NjKbSBelZunRlK21A8Qxux4iQyxQcX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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