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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789a60030c9ba4be2220e371db9645d6011777cc4fc53474fa33ddd20f2935a3' 
  AND token = 'o+y+DXcezqeswIkNlh2B8JyYy4FWabpeaIaiUB22ZJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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