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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8c51db5b69b3ac168fe699858ce54859c5cb8e384100e4d6f98a523655c519' 
  AND token = 'sakjabetl0uIroK/XZSKKWXKvgTrvO8DSUlb7GD+ThY=' 
  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"
    }
  }
}