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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616683c15d7b7fc43c4388e51e368d459c7f6dd766f1110597d9991ed8e662c3' 
  AND token = 'MioYMJSB2dOrKcg6iph9RLcRuKISkzN3MwKOyfjFmBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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