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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399a094df94ada0c558696a6329b365037ff731c6369d5b3f66948dd413afaff' 
  AND token = 'Bu8TASaNl2K8vDIibx6G7es8vC4CkcMK3Xvi+BpXUSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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