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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fafc33dad88e54d83043d7d56702aeb6cd9913d3e2edc3b6b9f3dba88077a1d' 
  AND token = 'Uge/EO/Wgv+rkwyJywOlkWwXydPCU9icXPWdpmPVvRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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