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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c22f27e93b927976bbbba2877fcebd4246b9452376acb53a1df37e627971e8' 
  AND token = 'ovaG87v+aw007mrL9jo/F5DVAf0d/7QSDcooYX3uZDY=' 
  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"
    }
  }
}