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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e1f70e4fb35f052d660d861a620cdeabe50c2f3cf48bdf33d98d961c97e66a3' 
  AND token = '9WoVsfBKzN6MU8krXfdoWkpZsrytuLV47BxU99NEMf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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