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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7b06bfa795d6d6e245a597186aa9961cd779881d972d7e467272f3f66f74f1' 
  AND token = 'fBaYJ0pwFB9MJarvccw+UY6py6rwAFeP6Gn0FTZk7so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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