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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d4c221912cf842170bac522a0666d6e657e6d345b5340b36599e3d5ce9c431' 
  AND token = 'WO70ckqDYmtKbvlvh3jq0/9huNycOJbkbffIxyI+Pnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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